Abstract
Thick holograms have been recorded in single crystals of KCl and NaF containing colour centres introduced by electron irradiation. Diffraction efficiencies up to 4.2% are reported and near an absorption band there is a characteristic ‘M’ shaped variation of efficiency with wavelength. These observations show that there is a strong phase contribution to the diffraction efficiency and a simple model is used to describe the properties of such mixed holograms.
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